Light source



Feb. 26, 1935. H. e. FITZ GERALD LIGHT, SOURCE Filed Nov. 7, 1932 2 Sheets-Sheet 1' Feb. 26, 1935. H. FlTZ GERALD LIGHT SOURCE Filed NOV. 7, 1932 W t a w m W w 0 w 4 4 m w ,0 y M a w. 0 w 0 4 7 M fl 9 w m M a 9 W m w w w 4 4 EVA a A 5 q r M 2 N. w w w k a x W w \A W &\ w w \t y M g fill/v a r /r/// f A 5 6. o w a a Patented Feb. 26, 1 1 935 UNlTE STATES PATENT OFFICE 51,992,199 LIGllT'SOURCE I,

\ Harold: Graves Fitz Gerald; Los Angeles, Calif assignon to Illuminating Engineering1C0.,,,Los

Angele s, Calif., a.partnershipconsisting of J. j C, Wright-and Harold Graves Fitz Gerald v Application liovemberi 7, isaaserial No.'641,588 I nciaimsl (or. 24091) This invention relates. to a light source, and

relates more particularlytoa light means for projectinga beam orishaft of'light. It is a general ob-jectof the present "invention '5 to provide a simple; compact and effective means or light source for projecting a compara-' tively small, intense-beamlof light. f i

' object of this invention is to novel and improved light source or jecting device suitable for 'use'in asignal or alarm system involving alight sensitive :or'photo electric cell. In accordance with the present invention, the light projecting device is 1effeotively masked or disguisedand its beam of projected light is not'readily seen-under ordir narylightconditions making the? device particularly adapted for usein burglar alarm or detection systems.

It is another object of the invention to pro: vide a light source of the character mentioned that is adapted to beinstalled. in various situationsand-locations, for example, it maybexin stalled in building partition or wall 1 of l different characters, Ion external brackets,

a It is another object of theinve'ntio n to. pro vide a light projecting means or lightgsource of "the character mentionedthat is operable to project a comparatively smnr intense beam of light a substantial distance and With a mum amount of diffusion. l

It is anoth er object of the inventi may be easily adjusted o'r modified stalled to provide for the proper projectionbi the light rays in the desired direction, and for the desired focus of the light.

mentioned that may be attached to by atypical electrical outlet plate one. wall or partitionso that it is not conspicuous ands'o that-its purpose is not apparent.

It is another object of 'the inventionto provide a novel and improved means for masking or disguising the outlet opening or light aperture of a device of the charactermentioned'. It is another objector the invention to pro-' I on to provide a device of the character mentionedthat It is another object of the invention to provide a light source or'light projecting device of the character mentioned that is particularly compact and that is constructedsothat itmay be entirely contained or arrangedin a wan or partition structure, for ex'ample -"between the lath andjplaster walls or faces of a partition.

"It is another object lof the invention to pro vide alight projecting device ofthecharacter source or or supporting a device of the character mentioned'whereb'y the beam or ray of light may b e directed to any point with great accuracy.

tions in various situations by utilizing readily illustrating 9 abiu'glar alarm f system 1 involving the light sourc [provided by; the present invention." Fig. 2 an enlarged vertical detailed sectional view of -fa typical installation of 'one structures form or. the invention. Fig. 3'fis] a traneverseline3-"3' O Il'Fig Z' 2K Fig; isavertlcal detailed sectional view arenas indicatedby line-4+4 on Fig. 2. Fig. 5 is a verticalforlongitudinal detionof an optional" means for mounting the device and Fig; Sis'la'detailed sectional view'taken as indicated by 1in,8 8Qn Fig.7. I

The present" invention has numerous applications; howevenit is particularly adapted for use "in a burglar alarm systeminvolving a photo-elem hen Throughout the following. detailed disclosure, I will describe 'severaltypical {embodiments and installations or applications of the present inventiongit being understood that the invention is specincfeatures-or applications about to be described, but is to be taken as including anyfeatures that may fall withintthe scope of the claims. Fig.1] or the drawings illustrates-in fa more or less diagrammatic" manner a burglaralarm system involving one embodiment of the'present invention and installed in; a buildingconstruction. The portion of the building structure illustrated in Fig. 1 of the 'drawings includes two exterior walls W and two partitions P forminga compartment or room R. Window s10 are provided in or carried mentioned that maybe easily and quickly niodifled to adapt it for difierent uses and installa- :zontal sectional*vievv offa portion of a building I detailed sectional ,view. taken as indicatea y it tailed sectional view of another formjoi the invention. Fig.6 is a longitudinal detailed .sectional View of still'another embodiment ofthe invention. Fig. '7 isa fragmentary sideeleva one'wall'w while a doorway. 1 1 is iormedin the vide a simple and efiective means'fo'r mounting a the cell or an} element sensitive to light; I

not to be. construed aslimited orrestr Q d-w h other wall W. The burglar alarm system when in operation is intended to give an alarm or signal in the event that any one enters the door 11 or the windows 10. Light responsive units or photo-electric cell units 12 are installed in the wall structures W adjacent their point of joinder to receive beams of light extending substantially parallel to the walls W and projected by the light sources 13 provided by the invention' In'the particular case illustrated inthe drawings, the light sources 13 are installed in the partitions P at points directly opposite the photo-electric cell units 12. The photo-electric cell units 12 may be operatively connected to any desired form of alarm device, signal, indicating instrument,protective device, or the like. Inthe event that aperson or object passes through or interferes with a beam of light produced by one of the light sources 13, the photo-electric cell normally receiving the light, actuates, or causes the actuation of the alarm oi indicating device with which it isconnected. a

A light source 13 of the. character illustrated in detail in Fig. 1 o-ithe drawings is illsutrated in detail in Figs. 2, 3 and 4. The embodiment of the invention illustrated in Figs. 2, 3 and 4 of the drawings, includes, generally, a body 15, a source of light'16' in the body 15, an optical system 17 for projecting a beam Of li ht from the body 15, and means 18 for mounting or supporting the body 15.

The bo-dy 15 is provided to carry or house the source of light .16, the optical system 17 and various other parts ofv the device. It is a feature of the invention that the body 15 may be modifled or varied to adapt it for use in various situations or installations, and that the parts makiing up or forming the;body 15 may be readily exchanged for others of various, sizes, etc., to provide for the installationof the device in any given situation and to provide for the proper and effecfive-projection of the light. ,Inthe'particular form of the invention being described, the body 15 is adapted to be'arranged in a wall or partition structure that is comparatively. thin; however, it will be apparent that the body may be carried by anexterior bracket or inany other manner.

The biody1l5 illustrated'in Figs. 2, 3 and i of the drawings is Zsectional, includingv anouter end section 19/ The outer end section 19 of the body 15 is a tubular member and is comparatively short. The section 19 may be in the nature of a simple cylindrical tubular member as illustrated-in the drawings. :Aflange collar'22 is provided on the outer end' ofthe outer section 19. The collar 22 and the section 19 may be loosely oradjustably connected. The central-section 20 of the body. 15 is tubular and is angular, being in the natureof an elbow. The inner end of the body section 19 removably and adjustablyflts into one arm 23 of theicentral section 20; The inner section 21' of the body maybe in the nature ot a straight tubular member and removably fits into the inner arm 24 of thecentral elbow section 20. In the form of the invention being de scribed 'the, inner section 21 is comparatively short and is somewhat'larger in diameter than be fully set forth in the description of the mounting illustrated in Figs. '7 and 8 of the drawings;

The body 15 may be positioned or arranged as foundpractical. In the particular installation illustrated in Fig. 2 of the drawings, the outer section 19 of the body 15 has its outer end facing outwardly toward one face of the partition P and the inner section 21. extends substantially parallel with the faces of the partition. The partition P is provided with an opening 27 in one of its walls or faces to receive the outer end of the body section 19. The opening 27 is preferably, formed sufficiently large to pass the collar 22 of the body withsubstanti al clearance and is entirely covered by the mounting means 18, as will be subsequently described. It will be apparent from an inspection of Fig. 2 of the drawings that the body 15 of the device is entirely housed or contained within the usual space found in typical partitions and wall structures.

' The source of light 15 is disposedin the inner section 21 of the body and is preferably inthe nature of a suitable, incandescent electric lamp 30. The lamp 30 is removably or replaceably carried in a typical socket 31 which receives electrical conductors 32. v The socket 31 extendsthrough a boss 33 and projects through an openinginxthe Wall of the section 21. The socket3l projects into the body section 21to support the lamp 30 in a position substantially midway between the ends tively small ray or beam, and to project this beam from the outer end of the outer section19. The

light handling means or optical system 17 ineludes an aperture member 34 mounted on the end of the body section 21 within the arm 24of the central section 20. The aperture member 34 extends across .the end of the section 2l and has a flange or lip 35 fitting into the section 21. A central light passing opening 36 is provided in the member 34. The opening 36 is concentric'with the opening in the section 21 and is thus aligned with the lamp 30. An, aperture plate 37 is provided on the member 34. The aperture plate 37 is provided with a comparatively small opening 38 registering with and concentric with the opening 36. The optical system 17 includes a reflector 39'mounted behind the lamp 30 for reflecting the light toward the aperture 36. The reflector 39 is in the nature of a concave spherical reflector and is supported by a carrier 40. A screw threaded stem 41 is provided on the reflector carrier 40 and is threaded through a boss on the cap 25. The reflector 39 is formed and positioned to concentrate the reflected, light at the apertures 36 and 28. The screw threaded stem 41 provides a means for accurately adjusting the reflector 39. 1

. The light handling means or opticalsystem 17 includes means for changing the direction of the beam passed by the aperture 38 so that itis projected outwardly from the outer end of the body section 19. A light reflecting device is provided on theaperture member 34 to reflect the beam rrom the opening 38 outwardly throughthe body section 19. In the preferred form of the invention, a prismatic reflector 42 is mounted on the aperture member 34 to reflect the beam from the openingBS outwardly through the body section V 19. The prism 42 is attached to the member 38 by a suitable clip or bracket 43. In the particular arrangement illustrated in the drawings, the aperture plate37 is arranged on the outer side of the member 34 under the prismatic reflector 42 so that'the bracket 43' operates to retain'both the reflector and the. plate. 37 on the'aperture l member 34. The beam of light from-the aperture.

vergence of the light rays of the beam'toward a remote point, for example, a photo-electric cell unit '12. The projection lens 44 may be in the nature of a plano-convex lens and may besup-i ported in a suitable carrier 45; By loosening" the set screw 26 the body "section 19 is freed so that it may be adjusted relative-t0 the central section '20 to provide for the'focusing of the beam. The

section 19 isalso adjustable relative tothe collar 22. A light filter 46 may beprovided in the outer body section 19 in frontof the lens 44. The light filter 46 may be of "any suitable color value, the color of the filter dependinguponthe light conditions prevailing in the compartment R. It has been found that ablue filter46 isusually effective, as it produces alight thatis more or less difiicult tosee. l l v c l The means 18 for mounting the bodyl5 provides for the positioning orarrangement of the device within the wall or partition structure and perm'itsthe accurate adjustment or settingof the body 15 so that the-beam of lightmay bedirected onto a remote point as desired. The mounting means 18 includes a mounting plate 47 adapted to be. attached'to the wall structure atthe open ing 27. Inthe typical installation illustrated in thedrawings, the plate 4'7 isattached to the face of the partition P by screws 48; The mounting plate 47 extends across the opening 27in the par: titionfand has a central'opening 49 concentrical- 19. -.One or more screws 50 pass through openi'ngs at diametrically opposite sides of .the openin g49'and thread intocopenings in the flanged collar 22. In the embodiment of .the' invention illustrated; there are four screws 501 at diametrie cally opposite'sides ofthe opening 49. Springs 51 surround the screws 50' and are arranged un-.

dercompression between the mounting plate 47 and-the end of the collar 22. It will be apparent how the screws 50may be employed to accurately adjust or set the body 15 in any desired position;

so that'the light beam is directed as desired. The springs 51 operate to maintain the body 15 in its set'or adjusted position. A conventional outlet plate 52 of' the typeco'mmonly employed in con nection with a service or convenience outlet may be provided to cover the mounting plate '47.. The

outlet'plate 52 entirely conceals the .mounting plate 4'? and gives the outer end of the device the appearance of a common outlet.

. The invention may include meansfor masking the outer end of the light source and for prevent:

sembling an open ended section of a honey-comb; The honey-combed plates 54 may be'carried in a The mask 53 is preferably provided with :a dullxblack tube 55 adapted to fit in-lthe opening 49.

or dark finish so'that it has notendencyto reflect the light. As the light rays of the beam immediately after passing through the projecting. lens 44 are substantially parallel, they pass through 54 with little or no' interference. Thehoney-' combed plates54 of themask 53 effectively conceal the lightedinterior of the deviceland prevent the dispersion ordivergence' of the light raysl Theembodi'mentof the invention illustrated in Fig; 5 of the drawings is adaptedtobe installed in a l'wallor partition structure where there is a comparatively large or wide space S behind the" wall. or "in the partition construction: This embodiment of theinvention includes generally a body 15 a source of light 16 an optical sys tem 1'7 in thebody 15 and means Ili -for mounting the body 15 on the walllor partition structure; PT. The body15ais a simple tubular member-Vin "the openings between the honey -combed plates 'cludingan elongate fltubular section closed; at"

its inner end by aldetachable cap 61 An adjusta I ble flanged collar 62 is'provided on the outer end .of theJoody section 60. .In the installationillustrated in Fig. 5,;th'e bodyzl5 extends inwardly from. the face of the wall. or partition Pand is disposed at substantially rightiangles tothe face of thewall or. partition P. x 1 The source of light 16 isgin theiorm of an incandescent electriclamp: 63 and ispositionedin the inner end portion ofthe body section 60." The lamp, 63 his carried by I a typical socket "641 The lamp socket 64 is carried in an opening-65 in l aboss projecting "from thebody section 60. The lamp63 is positioned so. that its filament is alignment withthe axis/of the body opening. j v :The opticalisyst'em. 17 for" handlingthe light from the light '.source 1 6 includes an aperture,

plate" 66 arranged in the bodysectionzlGO. in front of the lamp;63.v The aperture plate 66 is in the nature of *adisc extending across the -bodyopen-" ing 60% andisprovided. with a peripheral flange '67 seated on the wall ofqthe opening. Acorn. ly aligned with the opening in the body, section H parativ'ely small central opening .68 is provided in the aperture plate '66." The aperture 68-isc0-=- p 1 axial}. with .the body opening .60 and aligned with the,1amp 63, A concave spherical reflector 69 is mountedinzthe inner end' of the: body 15 behind the glamp 63; The reflector 69 is supported ;in a carrier 70; 1 The carrierM'IO includes lastemfll screw threaded through'rancpening in the cap 61' so that thejrefiector 69 maybe readily adjusted relativejto the lamp '63. The reflector 69 is. constructed andpositi'oned so as'to concentrate the refiected light at the aperture 4 68.1..Aprojection lens 72cis provided in the outer ender the body opening. 60 toprojectthe beam body section 60 between the lens 72 and] the aperture plate 66 tostraighten or condense the beam ofslight before it reaches thelens 72. i The two lens 72' and 72 may .be'of the same focal length; The combination. of the :lenses 72 and 72 v materially reduces-thenecessary effective lengthwof the optical system'between theaperture plate '66 and the outer lensflZ and permits the lens 72 to be'of small diameter without. in-

.c'reasing the sizeof therprojected beam; The

combination of 1 two spaced. projection lenses just I described may be used in the. embodiments of the. invention when. it is desirableto shorten the optical systemi'between the aperture plate and the outer end of'the body. A. light filtery'74of a suitable color value mayjbe mounted in" front of the projection lens '72. a I

The means 18 for mounting the body 15 may be identical with the mounting means 18 deposite sides of the opening 419 and'thre'ad into openings in the collar to support the bodyylb Springs 51 surround the screws and are arranged under compression between the collar 62 and the'mounting plate 47 The screws 50 may be employed to accurately set or adjust the body 15% while the springs 51 maintain the body in its set or adjusted position. Aconvenience or service outlet plate 55 may be provided to cover and concealthe' mounting plate 47 A mat 'box' or mask 53 'maybe providedin the opening 49 The mask 53 may be identical with the mask 53.described above, and operates to aid in preventing diffusion of the light and in concealing the'light sources. r Q The embodiment of the invention illustrated in Big. 6 of the drawings is operable to project a' beamiof lightua considerable distance and is adapted to. be installed in a wall or partition structure having a. comparatively small or narrow internal space' s. The light source illustrated in. detailin'. Fig. fifl'of the drawings includes, generally, a body 15 a light. source 16 in the body 15 an optical system 17 for-handling the light, and means 18 'for mounting or 7 carrying thebody 15 The form of the invention illustrated in Fig. 6

'of the drawings is operable to project: a light beam'aconsiderable distance and the body 15 is sufiiciently longto contain an optical system capable of effectively projecting the light beam the desired distance. The body 15 includes two end sections 80.and 81 and an elbow or angular central section 82. The end section may be a straight cylindrical tubular part providedat its outer end with an adjustable flanged" collar 83. The central section 82 is in the form of a tubular elbow and its outer arm 84 receives an end of the section 80. The inner body section 81ex- 1 tends into the other arm 85 of the central section and is an elongate tubular member. A detachable cap .86 closes the inner or lower end of the elongate inner section 81. The sections 80 and 81 are adjustably and removably held in the opposite ends of the central section82 and are attached to the central section by suitable set screws 87. In the installation illustrated inFig. 6, the body 15 is arranged inja .positionwhere the outer bodysection 80 is substantially. normal '.t0 the face of the wall or partition, while the inner section 81 is substantially parallel with the face of the partition and depends or projects downwardly from the central section 82. It is to be understood that the body 15 may be installed or' positioned as desired or found practical. A suspension lug 28 may be provided on the central section 82.

The source of light 16 is in the form of a suitable incandescent lamp 88and is carried. by a socket 89. The socket 89 extends through a boss 90 on the body section 81'to project into the body section. The lamp88is preferably positioned so that it is co-axi l with the opening 81* in the section 81.

The means 17* for handling the'light includes a reflector 91 positioned in the openingBl be hind the lamp 88. The reflector 91 is in the nature of a concave spherical reflector and is supported by.a carrier 92. A stem 93, is threaded through an opening inthe cap 86 whereby the reflector 91 may be adjusted relative to thelamp.

An aperture member 94 is mounted on the upper end of the'body sectionsl, within the arm 85 of the central section. The member 94 has 'densing lens 981s arranged'betweenthelamp 88"and the apertures 95 and 97. The condensing lens 98 is preferably positioned in the opening 81 at the point of maximum concentration of the light from the reflector 91 and is, such as to focus the light at the aperture 97. A carrier 99 supports the condensing lens 98 in the opening 81 A prismatic reflector 100 iscprovided on the aperture member to reflect the beam of light from the aperture 97 outwardly through the body section 80. the outer end of the body section 80; A ring or carrier 102 mounts the projection lens 101 in the-section 80. The body section 80 may be adjusted relative to the central section .82 to properly focus the beam of light on the distant point.

A light filter 103 may be mounted in the collar 83 in front of the lens 101.

The means 18 for mounting the body 15 is such that the bodymay be accurately adjusted -or positioned as found desirable or necessary.

outer end of the body section 80. Bolts or screws 108 extend through openings in the plate 105 at diametrically opposite sides of thelopening 107 and. thread into the outer end of the collar 83 to support the body 151?. l-lelicalsprings 109 surround the screws1108 and are heldunder' compression between the plate 105 and the collar 83. The screws 108 may be adjusted to accurately set or position the body 15'". An outlet plate 110 may be providedto cover and entirely conceal the mounting plate 105 A mat box or mask of the type illustrated in Figs. Zand '5 may be arranged in the opening 107 to aid in concealingthe outer end of the device and to aid in preventing the divergence of the light rays;

I have illustrated in Fig. 6 of the drawings, a false socket 112 that may be employed in place of the mask just mentioned The false socket 112 about to bedescribed may be wed in connection with any embodiment of the invention. The false socket 11.2 is formed to represent a common or typical socket of the type often found on extension wires or conductors and'adapted to fit in convenience outlets, etc. v In the particular case illustrated, the false socket 112 represents a twoway socket and includes an arm. 113 for ex-' A projection lens 101 is provided in receiving dummy conductorsvl l'lx An opening 11 8 extendslongitudinally through the aligned arms =113 and ll4 to pass the beam oflight from the light filter 1'03. The dummy-or false socket 112 effectively disguises the -unit orflight source so that itresembles a typical-convenience outlet gitudinal opening 118 in the-false socket 112 tends I to "prevent iuides'irable divergence ofthe light rays "and masks the outer endof the light source;

" F-igr '7 of the drawingsillustrates a means for suspending the body15 loione of the light sources or unitsof the' character describedabove,

The mounting Lor suspending means oft. the" mounting illustrated in the drawings may beeniployed to carry any of the embodiments 'of the 1 inventiong and is adapted to support alight source on rthe-exterior -of a wall,"partition', o'r the like. "optional mounting oi suspending means sion l22 corresponds to the lugs 28 and28 'idescribedaboveI Themeinber 120 may bea'ttached member 120-projects outwardly and is provided totthe lug-1122 by aset screw 123. The body 15? may beiturned to any desired or. suitable position prioritovtightening oflthe set screw 123. jThe withiatransverse opening 125. A stem 124 1 projects'from a plate 126 and-Jextends' through the opening 125. A set 'screw l27 is provided on the member 120 to clamp against the stem 124,- A

screwil30'is threaded. into anaopening in theinner 1 sideflofflthe plate' 126i .I'hej'screw/130 normally projects-from the inner side of the plate"-126 to act as apivot member; A socket 131 "may be provided inflthei platel26 to receive the head of th6iSC1eW l to permitthe effective adjustment 132 pass tthroughlspaced openings'in the -plate'i126 and .areadapted: to ithread into openings ina wall partition, alsuitable mounting p1ate,orthe like; The plate 126 maybe set at any desired I or suitable angle by suitably adjusting the screws 45;

132. Thescrew 130 acts asa pivot fon which the plate 126 may rock while it is being set or adjusted.

It is believed that the utility and practicability of the present invention will be readily apparent from the foregoing I detailed description. The invention provides light sources that may be installed or arranged in wall or partition structures: and in various other locations, and that are capable of projecting comparatively small intense beams of light. The'various body parts of the several forms described above as well as the elements andthe optical systems of the severalfiunits may be readily interchanged, thus permitting the devices to be modified to suit various installations The devicesare particularly simple and compact in construction and are entirely concealed when installed in parti:

tion of wall structures as illustrated in Eigs. l to 6 of the drawings. The masks 53 are particularly effective in preventing the divergence of theflight rays and in concealing the light sources. The false socket 112 is also effective in concealing the source of the light and in disguising .the device.

The means 18 for mounting the body 15 is such that the body may be set or positioned with great precision whereby the beam of light may be pro,- jected as desired.

The several forms or embodiments of the invention described above may be employed as the light'sensitive or photo-electric unitsof the syswhich employed in this manner thelamp is not used and a light sensitive .cell or element may be installed in the bo'dy' at or ad-jacent' therpoint occupied by 'lth lamp. Where the invention is embodied in a light receiving photo-'electric cell t unit, the light filtergthelight concentrating reflector; and like: parts' may be dispensedwith if desired. It will be apparent that the several formsof the inventionare adapted for'use lighti receiving light responsive or.:photo-elefctric cell 'Lunits with 'little or no modification.

' I-Iaving described only typically preferred forms of my invention, I do not wish to limit my;

self to the 'speoific -details set forth, but wishfto reserve to myself any changes or variations that mayappear to those skilledin thea-art or fall withinthescope ofthefollowingclaimsh .1 20

#I-Iaving described invention, I claim; j, 51 @Ailight source radaptedto be arranged in 'a partitionuor wall. structure havingfi an internal space andan openingin one face com-municating v withutherspace, said light source including a body adapted vto be positioned in the space, the body having antopening with an open end at said open inglin the face; assource of light inthe body opening,;me ans in the body opening controlling beinglaaccessible for adjustment from the outer sidemof the wall structure. wherebyathe beam'j may be accurately directed on" a remote point. Eu-2.IA light source adaptedtobe arranged in a partition or :wall tl'structure having an internal space andan :openingzin one/face coimnunicata ingwvith the spacefisaid light source including-a "body adapted to .be:positionedjentirely'within the space, the body having an openingxwithfan open end adjacent said opening in the face, meansiattached to: the outer 'facer of the wall structure for mounting the body,..a source of light in the "body opening; im'eans in the body openingffcontrolling the ilig ht' fromzthe source so as to "project a comparatively small beam from the open end of the body,,and means in said wall structure or the like, and having an opening I to register with the body opening, and'a'false electric socketextendingint'o the openingin the plate to disguise the combination and having an opening to register with the body opening.

'4, A light projecting device adapted to be installed in a partition or wall structure having an i internal space including a body to be arranged in the space and adapted to extendinto a lateral opening in the wall structure to have an end adjacent a face of the wall, the body having an opening with an open end adjacent said face,-

means in the body for projecting a beam of light from the open end of the bodyopening, and means for adjustably mounting the body including a member on the wall structure adjacent said lateral opening, and screws extending through i openings inthe member and threaded into openings in the end of the body,

T 5. .A light projecting device adapted to be ,installed in a partition or wall structure having ,an

internal space including .a bodyto'be arranged in the space and adapted to extend intoalateral opening in the Wall structure to have anend adjacenta face of the wall,.the body having an opening with an open end adjacent'said face,

10 ing a member on the wall structure adjacent said means inthe body for projecting a beam of light fromsthe open end of the body opening, and means for adjustably mounting the body includlateral opening,- scrcws extending through openings in the member and threaded into'opem'ngs in the body, and a spring arranged between the member; and the body. 1

.6, A light projecting device adapted to be installed in a partition or wall structure having an internal space including a body to be arranged in, the spacecand adapted to extend into a lateral opening in'the wall structure to have an end adjacent a. face of the wall, the body having an opening with an open end adjacent said face,

meansin the body for projecting a beam of light from the open end of the body opening, means mounting the body on the wall structure includ ing a mountingqplate on the face of the structure, and a'convenience outlet plate concealing the mounting plate. s

'7. Alight projecting, device adapted to. be installed in a partition or wall structure having an internal space including a body to be arranged in the space and adapted to extend into a lateral opening *in the wall structure to have an end adjacent a face ofthe wall, the body having an fopening with an open end adjacent said face,

said arms, a source of light in an end section, an aperture plate inythe central section, means for reflecting the beam from the aperture of the plate into the other end section, an objective lens sys.

tem in the said other end section. V

9. A device of the character described including, abody, means in, the body for projecting a beam of light, and means for mounting the body including a lug on the body, a mounting plate having apivot member on its inner side, an ad-. justable connection between the plate andflthe lug, and more than two screws passing, throughopenings in the plate spaced around the axis of the pivot member for attaching the plate to a support and operable ,totilt the platein any direction on the pivot member. p r

10,. A light source adapted tobe arranged in a partition or wall structure having an, internal space and anopening in oneface communicating with the space, said light source including a body adapted to be positionediin the space, the body" having a passage with an open-end jat said open-- ing in-the face, a source of light in the body passage, means in the body passage controlling the light from the source so as to project ,a small beam fromthe open end of the body, and means for adjustably mounting the body ,on the face of the wall structure, the last mentioned means including a mounting plate attached to the outer face of the wall structure and means adjustably' connecting the body and,plate.-.- i

.11. A device of the; character described eluding a body comprising two tubular sections and means connecting the sections in angular relation to oneanother andwhereby they are individually longitudinally adjustable, a light source in one section, an aperture plate in the body and carried by said section, a projecting lens in the other section for projecting a small beam of light froman end of the body, means on the aperture plate for changing the direction of the beam and means'adjustably mounting the body whereby the direction of the beam may be.

varied.

HAROLD GRAVES FITZ GERALD. 

